Rocketlok 14-20 Adjustable Kettlebell Solid cast steel body and handle with weighted interior cylinders milled from sold steel. Molded polyurethane cap with easy slide locking mechanism keeps weights safely secured. Adjust weights from 14, 17, 20 pounds Adjustable kettlebell that retains the traditional shape No tools required to add or remove weight The balance stays consistent at all weight levels which is highly important